Решение уравнений:

1. a) $$\frac{1}{6}x = 18$$ $$ x = 18 \times 6 $$ $$ x = 108 $$ Ответ: x = 108
2. б) $$7x + 11,9 = 0$$ $$ 7x = -11,9 $$ $$ x = \frac{-11,9}{7} $$ $$ x = -1,7 $$ Ответ: x = -1,7
3. в) $$6x - 0,8 = 3x + 2,2$$ $$ 6x - 3x = 2,2 + 0,8 $$ $$ 3x = 3 $$ $$ x = \frac{3}{3} $$ $$ x = 1 $$ Ответ: x = 1
4. г) $$5x - (7x + 7) = 9$$ $$ 5x - 7x - 7 = 9 $$ $$ -2x = 9 + 7 $$ $$ -2x = 16 $$ $$ x = \frac{16}{-2} $$ $$ x = -8 $$ Ответ: x = -8